Upright boiler



Patented Oct. I3, 1 953 .UrRIGH'r BoILEn John W. Throckmorton and John S. Wallis, New York, N. Y., assignors to Petro-Chem Process Company Incorporated, New York, N. Y., a corporation of Delaware Application March 22, 1949, serial No. 82,876

3 Claims. (Cl. 12b-281) 'I'his invention pertains to boilers of the upright or vertical type and is an improvement on the boiler disclosed in Patent No. 2,375,505, issued to Throckmorton and Wallis.

In that patent the vertical heat exchange tubes around the radiant section paSS upwardly through an annular convection zone and then enter a vertical header drum near its lower end.

The present invention improves on that arrangement by irst extending the heat exchange tubes upwardly to enter the drum near the top thereof within the convection zone formed between the drum and the boiler wall, and by adding comparatively short external tubes joining the upper and lower portions of the drum.

The short added tubes, and the portions of the main bank of vertical tubes within the convection zone are provided with extended'surfaces, usually in the form of fins.

As illustrated, the added tubes are in two concentric rings, but they may be otherwise arranged if desired.

Further and other objects and advantages will be apparent from the specification and claims, and from the accompanying drawings which illustrate what is now considered to be a preferred embodiment of the invention.

The drawing shows one embodiment of the invention, mostly in cross-section.

The boiler Wall comprises an' outer steel shell I!) lined with the usual insulation l2 and lire brick I4.

The floor I6, supported by metal plate I8, provides openings 20 for burners.

Above the radiant zone is a vertical drum 22 supported by a downpipe 24, joined at its lower end, by horizontal pipes 26, t the annular manifold 28 supporting heat-exchange tubes 30 extending upwardly through the radiant zone of the furnace to finally enter the side wall of drum 22 near the top thereof.

The annular space between drum 22 and the outer wall of the boiler forms a convection zone, and within that zone tubes 30, which are bare in the radiant zone, are provided with extended heat-absorbing surfaces which may be in the form of fins 32.

The upper and lower ends of drum 22 are interconnected by heat-exchange tubes 34 which are provided with extended-surfaces in 4the convection zone.

Additional banksof similar tubes may be added in the convection zone if desired, as for instance tubes 38 with ns do. Horizontal heat exchange ribs 42 may be used on tank 22 if desired.

Cil

2 f A cone 44, supported by .insulation 46 around downpipe 24, directs the hot radiant gasesinto the convection zone.

It isto .be understood that the invention is not limited to the specic embodiment herein illustrated and described, but may be used in other ways without departure from its spirit as defined by the following claims.

What is claimed is:

l. A vertical boiler having distinct heating zones, comprising a tall cylindrical combustion chamber, an upper drum centrally located in the combustion chamber at the upper end and forming an annular convection zone of the furnace, a single circular bank of long vertical tubes near the walls of the cylindrical combustion chamber extending through the convection zone and connected to the upper drum near the top, at least one cylindrical bank of short vertical Itubes located in said annular convection zone, each of said short tubes being connected to the upper drum near its ends and having extended surfaces over substantially its entire length, a central standpipe, axial burners within the unobstructed radiant zone of the furnace formed around the standpipe and within the circular bank of vertical tubes below the drum, anda drum below the burners to which the lower ends of the long tubes and the standpipe are connected, the long tubes having 'smooth outer surfaces in the radiant heating zone and having extended surfaces only in the convection zone.

2. A lvertical boiler comprising a tall cylindrical combustion chamber having two distinct heating zones, an upper cylindrical drum centrally located in the combustion chamber at the upper end largely lling the space and forming a relatively narrow annular convection zone of the furnace, a single circular bank of long vertical tubes near the walls of the cylindrical combustion chamber and forming the outside of an unobstructed radiant zone of the furnace, said bank of longvertical tubes extending through the convection zone and being connected to said upper drum at the top, at least one cylindrical bank o f short vertical tubes located within the convection zone, each of said short tubes connecting the top and bottom ends of said upper drum and having extended surfaces for substantially its entire length, a central standpipe having aV heat insulating covering, axial burners within the unobstructed radiant zone of the furnace formed aroundthe standpipe within thecircular bank of vertical tubes below the upper drum, a funnel shaped protecting baiile for the standpipe direct- 3 ing the hot gases into the convection zone, and a drum below the burners to which the lower ends of the long tubes and the standpipe are connected, the long tubes having smooth outer surfaces in the radiant heating zone and having eX- tended surfaces only in the convection zone.

3. A vertical boiler comprising a tall cylindrical combustion chamber having two distinct heating zones, an upper cylindrical drum centrally located in the combustion chamber at the upper end largely filling the space and forming a relatively narrow annular` convection zone 0f the furnace, a single circular bank of longvertical tubes near the walls of the cylindrical combustion chamber and forming the outside of an unobstructed radiant zone of the furnace, said bank of long vertical tubes extending through the convection zone and being connected to said upper drum at the top, a central standpipe having a heat insulating covering, axial burners within the unobstructed radiant zone of the furnace formed around the standpipe within the circular bank of vertical tubes below the upper drum, a funnel shaped protecting baille surrounding the 4 standpipe and terminating at the entrance to the convection zone and directing the hot gases into said zone, and a drum below the burners to which the lower ends of the long tubes and the standpipe are connected, the long tubes having smooth outer surfaces in the radiant heating zone and having extended surfaces only in the convection zone.

JOHN W. THROCKMORTON.

JOHN S. WALLIS.

References Cited in the ille of this patent UNITED STATES PATENTS Number Name Date 426,838 Moore Apr. 29, 1890 482,384 Plunkett Sept. 13, 1892 761,713 Restucci June 7, 1904 1,125,758 Stack Jan. 19, 1915 1,174,182 Rohrbacher Mar. 7, 1916 2,340,287 Throckmorton et al. Feb. 1, 1944 2,375,595 Throckmorton et a1. May 8, 1945 2,518,459 Frisch Aug, 15, 1950 

